Full Marks: 60
Pass Marks: 24
Time: 3 hours

Attempt any two questions: (2 x 10 = 20)

1. Draw a block diagram, truth table and logic circuit of a 16 x 1 multiplexer and explain its working principle.
2. Explain the 4 bit ripple counter and also draw a timing diagram.
3. Design the full subtractor circuit with using Decoder and explain the working principle.

Attempt any eight questions: (8 x 5 = 40)

4. Design a half adder logic using only NOR gate.
5. Convert the following decimal numbers into hexadecimal and octal number.
   • (a) 304
   • (b) 224
6. Describe the three Variable K-map with example.
7. Design the Decoder using Universal gates.
8. What is combinational logic? What are its important features.
9. Describe the clocked RS flip-flop.
10. What do you mean by triggering of flip flop?
11. What are the shift Register operations?
12. Describe the Ripple counter.
13. Write short notes on:
    • (a) Registers.
    • (b) Digital.
    • (c) EBCDIC.